MEDICINE BALL OVERHEAD WALKING LUNGE
This move works your total body with this added bonus: The overhead position of the weight keeps your posture in check, forces you to engage your core and adds extra resistance.
Stand with your feet hip-width apart and hold a medicine ball directly overhead with both hands. Your arms should be straight, back and head neutral, abs tight. Take a large step forward with one foot and bend both knees to lower into a deep lunge. Push off your back foot and bring your legs together, stepping forward. Continue, alternating legs, for distance.